Which is characteristic of all vertebrates?

A) a skull and a backbone consisting of vertebrae
B) a calcified (hard) skeleton and four legs
C) a hinged jaw
D) lungs or lung derivatives


Answer: A

Biology & Microbiology

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Radially symmetrical animals have loose meshes of neurons that are called

a. nerve nets. b. brain nets. c. ganglia nets. d. nerve cords. e. cephalization nets.

Biology & Microbiology

Contraction of the fibers labeled A in the accompanying figure results in:


a. elongation of the body.
b. elongation of the tentacles.
c. elongation of the gastrovascular cavity.
d. shortening of the body.
e. expansion of the pedal disk.

Biology & Microbiology

The energy source for the light reactions is _____; the energy source for the carbon reactions is ______.

A. ATP, carbon dioxide B. sunlight, carbon dioxide C. sunlight, ATP D. ATP, oxygen E. Sunlight serves as the energy source for both sets of photosynthetic reactions.

Biology & Microbiology

Cytokinesis in animal cells involves the formation of a/an:

a. oncogene b. cell plate c. cleavage furrow d. sister chromatid

Biology & Microbiology